Giant Keplerate molecule -the first octopole magnetA. S. Mischenko1, A. S. Chernyshov1 and A. K. Zvezdin2
1 Physics Department, Moscow Lomonosov State University - 119889 Moscow, Russia
2 General Physics Institute of RAS - 119991 Moscow, Russia
(Received 8 July 2003; accepted in final form 30 October 2003)
The multipole expansion technique is applied to one of the largest magnetic molecules, . The molecule's dipole, toroid and quadrupole magnetic moments are equal to zero (in the absence of magnetic field) so the multipole expansion starts from the octopole moment. Probably, the molecule is the most symmetrical magnetic body synthesized so far. The magnetization process is considered theoretically in different geometries. Some components of the octopole moment experience a jump while the magnetization rises linearly up to its saturation value. An elementary octopole moment consisting of four magnetic dipoles is proposed as a hint for designing of an experiment for the measurement of octopole magnetic-moment components.
75.50.Xx - Molecular magnets.
75.10.Hk - Classical spin models.
© EDP Sciences 2004